[dragonwriter]

> Did you read this part?

Yes, I also read the body text after the numbered heading in the prior excerpt, which makes two different choices in sentence-starting position in sentence case. But what I was responding to was the inference of a rule bases on usage in “title font” (which seems to be a reference to title case), not a complaint about the inconsistent use in sentence case. Hence, the except you provide here isn't really germane to anything I've said.

[bonoboTP]

They very correctly mix it to show that it does not matter. Better make some plots then bikeshed this to death.